Calculation Help

[hshi2021]

Hello Math Forums
Math is not my strength and I am having a struggle with a calculation.
This involves the data for the weight and balance of an aircraft.
a = 0
M = 262
r = 3103
R = 22952.5

508.186 - (27.0 + 0.00286M) sin a - 347.717r / W

Please calculate and spell out the order of the calculations.

Thanks in advance.